In order to make this an addon ped:
1. Extract the OIV
2. Rename the 4 model files to anything else (ghostrider)
3. Install as an addon ped.
4. Select model in-game FIRST, then "Toggle Powers (Keep Player Character)

On most of the mod install videos I've seen non of them end up with this model in the pictures. The same happened on my game, the biker characters all look cool but when I change into Ghost Rider he wears the normal online character biker clothes. What do you think has caused this?